Grade 2 · Math · Unit 5 of 12
Facts to 20
Add and take away
What your child practises
Fluent facts to 20 using strategies like making ten and thinking addition to subtract.
Prince Edward Island Curriculum curriculum outcome: N9; N10 · adding and subtracting facts to 20 with making ten and doubles
How we explain it
Children can open this short lesson before they practise.
- Use 10 as a stepping stone.
- Break one number to make a 10 with the other.
- Then add what is left over.
Example: 8 + 5 = ? 8 needs 2 more to make 10. Take 2 from 5. That leaves 3. 10 + 3 = 13. Answer: 13
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
What is 14 − 9?
14 − 9 = ?
- 5
- 0
- 11
5
Hint: Think addition: 9 + ? = 14. Or start at 14 and count back 9.
Question 2
What is 9 − 5?
9 − 5 = ?
- 1
- 4
- 3
4
Hint: Think addition: 5 + ? = 9. Or start at 9 and count back 5.
Question 3
What is 5 + 2?
- 5
- 7
- 8
7
Hint: Start at 5 and count up 2 more.
Question 4
What number is missing?
4 + = 16
- 18
- 12
- 10
12
Hint: Count up from 4 to 16. How many jumps did you make?
Question 5
What is 8 + 9?
8 + 9 = ?
- 18
- 20
- 17
17
Hint: Make a ten! 8 + 2 = 10, then add 7 more to get 17.
Question 6
What is 5 + 4?
5 + 4 = ?
- 12
- 9
- 11
9
Hint: Start at 5 and count up 4 more.